Tagged Questions

This question is motivated by a Quantum mechanical problem - but in explaining the problem - I assume no knowledge of quantum mechanics.
I want to define a function that can expand and simplify the ...

I need to combine data structures in operations analogous to addition, subtraction, multiplication and division (and more). I need more than one operation of each type, i.e. more than one method of ...

I am new to Mathematica, I am trying to generate the polynomial function of a operator. So for example, the operator $L $ is $\frac{\partial f}{\partial x}+\frac{\partial f}{\partial y} $, and I want ...

I have a differential equation defined as the product of operators which I want to expand out into a polynomial in powers of $z\frac{d}{dz}$
$\prod_{n=1}^p(z\frac{d}{dz}+a_n)$
However when I try to ...

I am looking the achieve a working set of Mathematica functions that would allow me to take products, commutators, etc. of (2x2) matrix differential operators and apply them to vector-valued functions ...

I am attempting to compute the elements of a list, $\{a_i\}$ given lists $\{b_i\}$ and $\{c_i\}$ using the following formula:
$a_i = \frac{1}{c_1}(b_i - \sum_{j = 2}^{i}c_{j}a_{i-j+1})$ for $1\leq i ...

I would like to evaluate the following (simplified) expression with Mathematica :
$\frac{\delta}{\delta J} \exp[(J(x)+K(x)) \Delta (J(x)+K(x))]$
where $\Delta$ is a differential operator independent ...

V10 introduces an operator form for several functions perhaps primarily due to their role in queries as part of introducing data science functionality. At first pass it seems a lot of effort to add ...

I would like to calculate the Gateaux derivative of a functional (i.e. a function depending on functions). A simple example for the Dirichlet functional:
$L(u(x))=\int_0^1 \frac{1}{2} (u'(x))^2 dx$
...

I am looking to define a new operator that would work similarly to the + or - operator. My end goal is to make a dice operator for calculating random distributions in the normal d20 fashion (e.g. 5d6 ...

I was wondering, *for which countries is the proportion of Phone line users to population greater than or equal to that of the United States?*
This is what I inputted below, but the list of countries ...

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